#!/bin/bash

# Copyright Istio Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

WD=$(dirname "$0")
WD=$(cd "$WD"; pwd)
ROOT=$(dirname "$WD")

set -eu

# LOCAL_OUT is set when runing in a Makefile and set to current architecture (not host)
if [[ ! -z "${LOCAL_OUT+.}" ]]; then
  OS_ARCH=${LOCAL_OUT##*/}
  LOCAL_TARGET_OS=${OS_ARCH%_*}
  LOCAL_TARGET_ARCH=${OS_ARCH##*_}
else
  LOCAL_TARGET_OS=${TARGET_OS:-linux}
  LOCAL_TARGET_ARCH=${TARGET_ARCH:-amd64}
fi

cd "${ROOT}"

export REPO_ROOT="${ROOT}"

if [[ -f out/${LOCAL_TARGET_OS}_${LOCAL_TARGET_ARCH}/docker-builder ]]; then
  CURRENT_BUILD="$(./common/scripts/report_build_info.sh | grep buildGitRevision | cut -d= -f2)"
  PREBUILT="$(out/${LOCAL_TARGET_OS}_${LOCAL_TARGET_ARCH}/docker-builder --version)"
  CODE_CHG="$(git diff ./tools/docker-builder)"
  if [[ "${CURRENT_BUILD}" != "${PREBUILT}" ]] || [[ -n "${CODE_CHG}" ]]; then
    GOOS=${LOCAL_TARGET_OS} GOARCH=${LOCAL_TARGET_ARCH} ./common/scripts/gobuild.sh out/${LOCAL_TARGET_OS}_${LOCAL_TARGET_ARCH}/docker-builder ./tools/docker-builder
  fi
else
  GOOS=${LOCAL_TARGET_OS} GOARCH=${LOCAL_TARGET_ARCH} ./common/scripts/gobuild.sh out/${LOCAL_TARGET_OS}_${LOCAL_TARGET_ARCH}/docker-builder ./tools/docker-builder
fi
out/${LOCAL_TARGET_OS}_${LOCAL_TARGET_ARCH}/docker-builder "$@"
